Granted Patent
Utility
US 5,670,048 · App. 08/601,378
Preparatory supercritical fluid extraction using sealed chamber
Inventors:
Dale A. Davison, Henry L. Walters
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Feb 14, 1996
Inventors
Dale A. Davison
Henry L. Walters
Assignee (at issue)
Isco, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.